Ideas on what's causing my click/tick/rattle noise?

Just a question.....you know there are cast crank and forged crank engines, I am sure. Unlike the V8s, the slant 6 uses different bearings in each engine. Forged crank engines have their respective blocks, cranks and rods that are all different than that of a cast crank engine. They also use different bearings. Is it possible "any of that" got mixed up?